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In a computer's central processing unit (CPU), the accumulator is a register in which intermediate arithmetic logic unit results are stored.. Without a register like an accumulator, it would be necessary to write the result of each calculation (addition, multiplication, shift, etc.) to cache or main memory, perhaps only to be read right back again for use in the next operation.
The hardware unit that performs the operation is known as a multiplier–accumulator (MAC unit); the operation itself is also often called a MAC or a MAD operation. The MAC operation modifies an accumulator a : a ← a + ( b × c ) {\displaystyle a\gets a+(b\times c)}
add the contents of a memory cell to the accumulator. 3: TAC: Test accumulator contents performs a sign test on the contents of the accumulator; if minus, jump to a specified memory cell. 4: SFT: Shift shifts the accumulator x places left, then y places right, where x is the upper address digit and y is the lower. 5: OUT: Output
In 1967, Fairchild introduced the first ALU-like device implemented as an integrated circuit, the Fairchild 3800, consisting of an eight-bit arithmetic unit with accumulator. It only supported adds and subtracts but no logic functions. [7] Full integrated-circuit ALUs soon emerged, including four-bit ALUs such as the Am2901 and 74181.
Folds can be regarded as consistently replacing the structural components of a data structure with functions and values. Lists, for example, are built up in many functional languages from two primitives: any list is either an empty list, commonly called nil ([]), or is constructed by prefixing an element in front of another list, creating what is called a cons node ( Cons(X1,Cons(X2,Cons ...
Accumulator (computing), in a CPU, a processor register for storing intermediate results; Accumulator (computer vision), discrete cell structure to count votes, standard component of the Hough transform; Accumulator (cryptography), a value, determined by a set of values, that allows one to verify if any one of the original values is a member of ...
A variety of computer arithmetic techniques can be used to implement a digital multiplier. Most techniques involve computing the set of partial products, which are then summed together using binary adders. This process is similar to long multiplication, except that it uses a base-2 numeral system.
They are accumulator machines, with a common accumulator "W" being one operand in all 2-operand instructions. In the instruction set tables that follow, register numbers are referred to as "f", while constants are referred to as "k".